有没有一种简单的方法来绑定 StringProperty 对象的串联?
这是我想做的:
TextField t1 = new TextField();
TextField t2 = new TextField();
StringProperty s1 = new SimpleStringProperty();
Stringproperty s2 = new SimpleStringProperty();
Stringproperty s3 = new SimpleStringProperty();
s1.bind( t1.textProperty() ); // Binds the text of t1
s2.bind( t2.textProperty() ); // Binds the text of t2
// What I want to do, theoretically :
s3.bind( s1.getValue() + " <some Text> " + s2.getValue() );
我怎样才能做到这一点?
你可以做:
s3.bind(Bindings.concat(s1, " <some Text> ", s2));
这是一个完整的示例:
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class BindingsConcatTest extends Application {
@Override
public void start(Stage primaryStage) {
TextField tf1 = new TextField();
TextField tf2 = new TextField();
Label label = new Label();
label.textProperty().bind(Bindings.concat(tf1.textProperty(), " : ", tf2.textProperty()));
VBox root = new VBox(5, tf1, tf2, label);
Scene scene = new Scene(root, 250, 150);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
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